Random RFC 4193 unique local /48 prefix, the /64 for your subnet ID and an example host address.
IPv6 Expander & Compressor
Runs locally
Use IPv6 Expander & Compressor
What it does
Expand a shortened IPv6 address to its full eight groups, or shorten it with ::. Logs, blocklists and RDAP records often store different forms of the same address, which makes plain-text searches miss.
It runs entirely in your browser: nothing you enter is uploaded.
Example
Shortened address
2001:db8::8a2e:370:73342001:0db8:0000:0000:0000:8a2e:0370:7334Load example runs Expand and gives 2001:0db8:0000:0000:0000:8a2e:0370:7334.
FAQ
What do Expand and Compress do?
Expand fills in the zero groups hidden by :: and pads every group to four hex digits. Compress shortens all-zero groups to 0 and replaces the first run of two or more of them with ::.
Is the compressed form RFC 5952 canonical?
Not always. Compress keeps one leading zero in groups such as 0db8 or 0001 (giving 2001:0db8::01 instead of 2001:db8::1) and shortens the first zero run rather than the longest. Letter case is kept, input is not validated, and embedded IPv4 (::ffff:192.0.2.1) is expanded incorrectly.
Is the address sent anywhere?
No. Both operations are string processing in your browser.